In 2011, Oswald Danes trended on Twitter as well following his first television appearance during Miracle Day, the hashtag saying #forgive. (TV: Rendition)
At one time during an incident on Earth when certain women worldwide were being driven to unprecedented irrational heights, the number one trending Twitter hashtag was #realfemmefatales. (PROSE: Exodus Code)
Clara Oswald asked her class at Coal Hill School to use their mobile phones to spread the word on Twitter when she noticed that a plane outside her window had stopped moving, using the hashtag #ThePlanesHaveStopped. (TV: The Magician's Apprentice)